Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 1,056	$ 749	$ 874	$ 634
Ending Balance	1,184	762	1,184	762
Pension and OPEB liability adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(21)	5	(17)
Amounts reclassified from AOCL	(3)	(2)	(9)	(7)
Income tax benefit (expense)	1		2	1
Net current period other comprehensive (loss) income	(2)	(2)	(7)	(6)
Ending Balance	(2)	(23)	(2)	(23)
Interest rate swaps
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	17	1	15	(24)
Other comprehensive income (loss) before reclassifications	4	16	11	43
Amounts reclassified from AOCL	(3)	1	(8)	7
Income tax benefit (expense)	(1)	(4)	(1)	(12)
Net current period other comprehensive (loss) income		13	2	38
Ending Balance	17	14	17	14
Foreign currency items
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(42)	(40)	(42)	(32)
Other comprehensive income (loss) before reclassifications	(5)	(12)	(5)	(20)
Net current period other comprehensive (loss) income	(5)	(12)	(5)	(20)
Ending Balance	(47)	(52)	(47)	(52)
Accumulated Other Comprehensive (Loss) Income, net of tax
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(25)	(60)	(22)	(73)
Other comprehensive income (loss) before reclassifications	(1)	4	6	23
Amounts reclassified from AOCL	(6)	(1)	(17)
Income tax benefit (expense)		(4)	1	(11)
Net current period other comprehensive (loss) income	(7)	(1)	(10)	12
Ending Balance	$ (32)	$ (61)	$ (32)	$ (61)